Rapid raise completion method using hydraulic fracturing and blasting technology

Abstract

The invention discloses a rapid raise completion method using a hydraulic fracturing and blasting technology, which comprises the following steps of: arranging drill holes including a fracturing hole, a central hole and a blasting hole on an excavation section of a raise, performing hydraulic fracturing on the fracturing hole, and implementing segmented millisecond blasting of a deep well from bottom to top after the hydraulic fracturing expectation is achieved, so as to realize one-step completion of the deep well. According to the method, the advantages of hydraulic fracturing and blasting technologies are combined, hydraulic fracturing is effectively utilized to soften and crush surrounding rock in advance, more free surfaces are created for subsequent blasting, the section form of the raise is controlled through blasting, safe, environment-friendly, efficient and low-cost rapid well completion of the deep well is achieved, meanwhile, vibration damage of blasting to the well wall is reduced, and the service life of the raise is prolonged. Operation conditions are improved, environmental pollution is reduced, safety risks of raise tunneling are controlled, the technology is mature, the process is simple, and the method has good popularization and application value.

Description

Technical Field

[0001] The invention belongs to the technical field of metal mines, in particular to a method for quickly forming a well by using hydraulic fracturing and blasting technology. Background Art

[0002] In the underground mining process of metal mineral resources, the patio is an indispensable and important part. The excavation efficiency and cost of the patio have an important impact on the production efficiency, output and economic indicators of the mine. Safe and practical patios provide guarantees for the sustainable and healthy development of mines. At present, the methods of patio excavation in underground mines include ordinary method, hanging tank method, climbing tank method and drilling method. Due to the shortcomings of poor working environment, high labor intensity, low working efficiency, high safety risk, large investment in drilling method, and high requirements for process site, the one-time blasting well construction has the advantages of high excavation efficiency and convenient construction, and is widely used. The one-time blasting well construction technology has the problems of high cost, poor safety, environmental pollution, and blasting damage to the well wall affecting the later operation and maintenance. How to achieve safe, efficient, low-cost and practical rapid excavation of the patio has become a scientific and technological problem that needs to be studied and solved in the excavation of underground mine patios.

[0003] In previous studies, the existing CN110307762B named "A rapid well construction method for a skylight based on deep hole hole-by-hole blasting technology" proposed a rapid well construction method for a skylight based on deep hole hole-by-hole blasting technology. Its main steps are: 1. Dig connecting lanes at both ends of the skylight to determine the center position of the shaft; 2. Expand the top of the lower skylight connecting lane, and use down-the-hole blasting to form a chamber space; 3. Arrange blast holes along the skylight section, including charging holes and large-diameter empty holes. The charging holes are divided into core and multi-layer charging holes, and the large-diameter empty holes are arranged in a diamond shape, and then charge according to the design and blast to form a well. CN 118031746 A Name "A deep well blasting one-time well construction method with gradually increasing blasting section height" provides a method of staggered arrangement of slot holes, empty holes and peripheral holes from the inside to the outside in sequence around the center of the working face of the to-be-excavated skylight; adopts segmented blasting from bottom to top, and the segmented section height gradually increases according to the increase in the space that can accommodate the broken ore rock at the bottom of the to-be-excavated skylight. The above method optimizes the blasting method for deep well excavation, improves the excavation efficiency, and does not achieve the problems of reducing safety risks, reducing the disturbance of blasting to the well wall, reducing costs and reducing environmental pollution. Summary of the invention

[0004] The present invention provides a method for completing wellbore construction by using hydraulic fracturing and blasting technology, which can make full use of hydraulic fracturing for advanced softening and crushing, and blasting wellbore section control, so as to save explosives, reduce disturbance, reduce environmental pollution, control safety risks, and realize deep well safety, environmental protection, high efficiency, and low-cost rapid well completion.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme:

[0006] A method for rapid well completion in a patio using hydraulic fracturing and blasting technology, the method comprising: arranging drill holes in the patio excavation section, including fracturing holes, center holes and blasting holes, hydraulically fracturing the fracturing holes, and after achieving the expected hydraulic fracturing, performing segmented micro-difference blasting of a deep well from bottom to top to achieve one-time well completion of the deep well.

[0007] Further technology of the present invention:

[0008] Preferably, the fracturing holes and the center hole are arranged in the middle of the excavated section of the skylight, the fracturing holes are evenly arranged circumferentially around the center hole, and the blasting holes are arranged around the skylight section.

[0009] Preferably, in each section of micro-difference blasting, the central hole is detonated first, and then the peripheral blasting holes are detonated.

[0010] Preferably, the following steps are performed:

[0011] Step 1: Drilling: At the upper section of the patio, use a drilling rig to perform fracturing and blasting drilling construction on the vertical patio section. Smooth blasting drilling holes are arranged around the patio section, and fracturing holes and center holes are arranged in the center of the section.

[0012] Step 2: Fracturing: Push the sealer into the fracturing hole to perform segmented fracturing. Inject high-pressure water into the sealing section of the fracturing hole, and fracture backwards from the bottom of the borehole to the hole mouth according to the fracturing position requirements until water flows out of the observation hole and stops fracturing.

[0013] Step 3: Sealing the hole: After the fracturing is completed, take out the sealer and seal the fracturing hole;

[0014] Step 4: Charge and connect: After the fracturing operation is completed, the center hole and blasting hole are charged, connected and sealed in sections;

[0015] Step 5, blasting: After the charging and connection are completed, connect the blasting network, and carry out the segmented micro-difference blasting of the deep well from bottom to top to realize the one-time completion of the deep well.

[0016] The beneficial effects of the present invention are:

[0017] The present invention combines the advantages of hydraulic fracturing and blasting technology, effectively utilizes hydraulic fracturing to soften and crush surrounding rock in advance, creates more free surfaces for subsequent blasting, and controls the cross-sectional morphology of the shaft by blasting, thereby achieving safe, environmentally friendly, efficient, and low-cost rapid well completion of deep wells. At the same time, it reduces the vibration damage to the well wall caused by blasting, improves working conditions and reduces environmental pollution, and controls the safety risks of shaft excavation. The technology is mature, the process is simple, and it has great promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the drilling of the upper section of the patio. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be further described in detail below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention but not all. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] like Figure 1 This embodiment provides a method for rapid well construction using hydraulic fracturing and blasting technology. Through drilling arrangement, hydraulic fracturing technology is used to soften and crush the surrounding rock; then, segmented micro-difference blasting technology is used to control the breakage of the well section and the rock from bottom to top, providing protection for the later operation and maintenance of the well wall, thereby achieving safe, environmentally friendly, efficient and economical rapid well construction. The specific steps are as follows:

[0022] Step 1: Drilling: At the upper section of the patio, use a drilling rig to perform fracturing and blasting drilling construction on the vertical patio section. Smooth blasting drilling holes are arranged around the patio section, and fracturing holes and center holes are arranged in the center of the section.

[0023] Step 2: Fracturing: Push the sealer into the fracturing hole to perform segmented fracturing. Inject high-pressure water into the sealing section of the fracturing hole, and fracture backwards from the bottom of the borehole to the hole mouth according to the fracturing position requirements until water flows out of the observation hole and stops fracturing.

[0024] Hydraulic fracturing achieves the initiation and expansion of surrounding rock cracks and controls the fracture network in the surrounding rock;

[0025] Step 3: Sealing the hole: After the fracturing is completed, take out the sealer and seal the fracturing hole;

[0026] Step 4: Charge and connect: After the fracturing operation is completed, the center hole and blasting hole are charged, connected and sealed in sections;

[0027] Step 5, blasting: After the charging and connection are completed, connect the blasting network and carry out the segmented micro-difference blasting of the deep well from bottom to top. In each segment of micro-difference blasting, first detonate the center hole and then detonate the surrounding blasting holes to achieve one-time completion of the deep well.

[0028] Hydraulic fracturing technology is used to increase the number of rock cracks and strictly control the development morphology of cracks to form a suitable fracture network, so as to achieve pre-cracking, softening and crushing of the rock. At the same time, in the process of high-pressure water infiltration of the rock, the rock microstructure and water content are changed, the rock strength is reduced and the rock crushing dust is controlled. Subsequently, the segmented micro-difference smooth blasting technology is used to control the shaft section and rock crushing from bottom to top, providing protection for the subsequent well wall operation and maintenance, thereby achieving safe, environmentally friendly, efficient and economical rapid well completion.

[0029] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for rapid well construction using hydraulic fracturing and blasting technology, characterized in that: The method comprises the following steps: arranging drilling holes in the excavation section of the skylight, including fracturing holes, center holes and blasting holes, hydraulically fracturing the fracturing holes, and after achieving the expected hydraulic fracturing, performing segmented micro-difference blasting of the deep well from bottom to top to achieve one-time completion of the deep well.

2. A method for rapid well construction using hydraulic fracturing and blasting technology according to claim 1, characterized in that: The fracturing holes and the center hole are arranged in the middle of the excavated section of the skylight, the fracturing holes are evenly arranged circumferentially around the center hole, and the blasting holes are arranged around the skylight section.

3. A method for rapid well construction using hydraulic fracturing and blasting technology according to claim 1, characterized in that: In each section of micro-difference blasting, the center hole is detonated first, and then the surrounding blasting holes.

4. A method for rapid well construction using hydraulic fracturing and blasting technology according to claim 3, characterized in that: Follow these steps: Step 1: Drilling: At the upper section of the patio, use a drilling rig to perform fracturing and blasting drilling construction on the vertical patio section. Smooth blasting drilling holes are arranged around the patio section, and fracturing holes and center holes are arranged in the center of the section. Step 2: Fracturing: Push the sealer into the fracturing hole to perform segmented fracturing. Inject high-pressure water into the sealing section of the fracturing hole, and fracture backwards from the bottom of the borehole to the hole mouth according to the fracturing position requirements until water flows out of the observation hole and stops fracturing. Step 3: Sealing the hole: After fracturing is completed, take out the sealer and seal the fracturing hole; Step 4: Charge and connect: After the fracturing operation is completed, the center hole and blasting hole are charged, connected and sealed in sections; Step 5, blasting: After the charging and connection are completed, connect the blasting network, and carry out the segmented micro-difference blasting of the deep well from bottom to top to realize the one-time completion of the deep well.

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